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Old 07-14-2009, 09:30 PM   #1
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Getting the best MPG

I'm just curious to see what kind of setup will be the most aerodynamic. I know that you can't improve the TJ from 15 all the way to 30 but I just want to know the best setup to squeeze an extra 2 or 3 or even 1 mpg. By setup I mean as

1. Hard top or Soft top (down/up/off)
2. Doors or no Doors (and what kind of doors)
3. Backseat (Down/Up/Removed)

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Old 07-14-2009, 09:37 PM   #2
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I seem to get the best MPG with the soft top on. My guess is that the hard top is too heavy and the Safari causes too much drag (yeah, my seats are out).

I get nearly 16 with the soft top on.
Right around 15 with the hard top and,
Just at 14 with the safari.

p.s. anyone that reports 30 MPG with a 4 liter TJ is pushing it 75 miles per tank, lying, smoking some REALLY good $hit or can't do math.

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Old 07-14-2009, 09:45 PM   #3
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Top On, Doors On. (as per your question)
Its a 6cyl, it gets bad mileage. Every 4X4 truck I have had (V8s) has gotten better gas mileage. It is a Jeep Thing. I didn't buy it for the mileage.
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Old 07-14-2009, 09:58 PM   #4
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Soft top down, doors off. Less weight w/ doors off. Tires aired properly. Easy on the go pedal.
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Old 07-14-2009, 10:03 PM   #5
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Okay, right now I'm rocking the no doors/no seat. I will report my avg city MPG with a full tank, then do half doors / no seat then half doors / folded seat.
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Old 07-14-2009, 11:39 PM   #6
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I get 15ish averaged out. from the badlands home was 170 miles. I was getting almost 22 for some reason with 33's and the top doors on it. (soft top soft uppers on my doors). I have a 4 cycl
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Old 07-15-2009, 12:23 AM   #7
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i have always found that my gas mileage drops when i have the top off and increases when i have the top on but i havent checked my mileage with doors off or with back seat folded or removed
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Old 07-15-2009, 08:23 AM   #8
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i have always found that my gas mileage drops when i have the top off and increases when i have the top on but i havent checked my mileage with doors off or with back seat folded or removed
You should definitely see better mileage with the top and doors on (and the windows up for that matter..), there is less drag on the truck with a "shell" to push the air past it.. The reason its not a gigantic increase is cause the drag coefficient of the entire vehicle is so low to begin with.
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Old 07-15-2009, 02:06 PM   #9
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I agree w/ Dylan - I think drag, or "dirty air" is going to have more impact than weight. But I also think you're doomed - all that air flow at the front of the Jeep is going to overwhelm anything you do with tops or doors. It's not just the brick shape and flat windscreen, it's the high body with exposed steering bits, and the huge amount of non-smooth protuberances, like exposed wipers, recessed headlights, chunky bumper, and on and on.

I bet an "airsplitter" front dam like sports car have would do more than anything else. But I wouldn't recommend it: it would look really bad.
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Old 07-15-2009, 02:42 PM   #10
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Ask Tripp.

Haha, a former forum member said he developed a wrangler nose cone that promised 50 mpg's. That was good for a laugh, but I think he was being serious.
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Old 07-15-2009, 03:09 PM   #11
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Top on, top off, doors on, doors off, more weight, less weight, up hill, down hill....it don't matter....a jeep is a cinder block going down the road.
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Old 07-15-2009, 04:15 PM   #12
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Ask Tripp.

Haha, a former forum member said he developed a wrangler nose cone that promised 50 mpg's. That was good for a laugh, but I think he was being serious.

tripp no longer on here?
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Old 07-15-2009, 05:33 PM   #13
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My TJ gets the best mileage sitting in the driveway as the Subaru drives away. The best option is to buy a car that is fun to drive and gets good mileage to complement the Jeep. I would be surprised if Jeep even bothered putting the Wranglers in a wind tunnel during the design process. Sammy Hagar can't drive 55, but I sure can with a smile on my face. The best way to improve gas mileage on the freeway is to SLOW DOWN! Most people don't realize that drag increases exponentially as speed increases. Drag at 80 mph is not twice as much as the drag at 40 mph. Good luck!
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Old 07-15-2009, 05:34 PM   #14
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tripp no longer on here?
No
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Old 07-15-2009, 07:14 PM   #15
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You only bought the jeep because they are kick ass lookin, fun to drive, and it gets you where you need to go both on and off road.
They are not practical in means of gas mileage, no matter how hard anyone tries.
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Old 07-15-2009, 08:08 PM   #16
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No
you know what happened to him?
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Old 07-15-2009, 09:50 PM   #17
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^ yes I do.
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Old 07-16-2009, 12:05 AM   #18
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I have a 99tj with a 4.0l, 2.5 skyjacker lift and 31 x 10 tires. With top down, full doors on and windows rolled down, and driving between 60 and 65mph on the highway, i am getting 20 mph to the gallon.
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Old 07-16-2009, 12:08 AM   #19
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I have a 99tj with a 4.0l, 2.5 skyjacker lift and 31 x 10 tires. With top down, full doors on and windows rolled down, and driving between 60 and 65mph on the highway, i am getting 20 mph to the gallon.
Must be nice. Too bad you can't bottle those fixes you made and give all of us 20 MPG.
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Old 07-16-2009, 10:18 AM   #20
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No doors/no seat = 13mpg city.
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Old 07-20-2009, 06:36 PM   #21
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top off , doors on, windows down = 18.8 city.

i think my earlier one with doors off is wrong... I will redo that .
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Old 07-20-2009, 07:03 PM   #22
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I go 22 mpg!!!! on the way back from Whittier Nc this weekend in my 6 speed 6 cyl 2006 LJ soft top on, full doors and only 30x9.5 tires, the fuel had no ethanol and that made for a 50 mile tank increase.
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Old 07-20-2009, 07:10 PM   #23
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TJ 4.0L
soft top, doors on highway/city driving
no backseat
= 16mpg
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Old 07-21-2009, 02:51 AM   #24
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Crappy no matter what combination of hardtop - doors, soft top - doors. nothing etc. I am using. Its a box on wheels with an almost flat piece of glass leading it off. But I love it and drive the Journey on road trips and when I want the MPG. I stopped bothering to try to increase the MPG years ago
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Old 07-21-2009, 05:10 AM   #25
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If you have stick, pay attention to your idiot light for shifting. (Look at my specs in my sig) yes I crawl and sometimes it's a bit annoying but I can squeeze 22 mpg out of my 2.5 if I really granny gear it.
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Old 07-21-2009, 05:58 PM   #26
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If you have stick, pay attention to your idiot light for shifting. (Look at my specs in my sig) yes I crawl and sometimes it's a bit annoying but I can squeeze 22 mpg out of my 2.5 if I really granny gear it.
That's exactly what I do. Manual shifter and I go from 0 - 60 in 20 seconds.
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Old 07-21-2009, 06:58 PM   #27
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I get 14-15 mpg despite my 35x12.5 tires and 5.5" lift if I take it easy. I keep it about 60 with cruise control on the freeway. Hard to believe but true. Driving style has alot to do with it. My typical driving style yields closer to 12 mpg.
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Old 07-21-2009, 07:58 PM   #28
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I just got my 2006 TJ Unlimited Rubicon and I seem to only be getting about 10 or 11 stock. Is this normal? YIKES!!!! This is a soft top version.
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Old 07-21-2009, 09:59 PM   #29
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06 4 liter, top off. I don't hit the highway much and generally play on dirt roads or trails. I went to the Champion truck plugs. I seem to be getting better mileage all around then with the NKG's. I am averaging between 16 and 17 and this is just bouncing around in southern AZ. So I Happy with the truck plugs! Don't have any idea how it would work commuting.
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Old 07-21-2009, 11:39 PM   #30
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I get 14-15 regardless of what I have on or off. If/when I want to play the gas mileage game, I drive my corolla, where I can honestly pull off 33-35 in combined driving. Its almost a game to see just how much mileage I can eke out of its measly tank of gas (all 11gal of it). But back to the jeep, I spend way more on parts, maintenance, and payments than I will on gas anytime soon, so I dont worry too much about it.

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